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I've hit the wall in my car at 50% ethanol. Long term fuel trim is maxed out, it won't go any higher. I have some cold start and throttle response issues.
So I'm going to probably back off to 30% ethanol or so. The car runs REAL well on E30. If there is a mileage difference, it is too small to notice. Power is good, no issues with cold start whatsoever.
E30 is like 95 octane or so, so you're getting premium fuel for about 20 cents a gallon less than regular.
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